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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Have you monitored the temp reading the PCM is getting when this occurs using a scan tool?
What liter engine?
How often is this occurring?
It appears that everyone has done all the checks and ruled this out to be electrically related.
I suggest you do steps that include replacing the thermostat, inspecting the water pump impeller, confirm no restriction in the radiator, and do a cooling system pressure test to see if there are air pockets in the cooling system preventing coolant flow. Reving the engine will not effect the coolant temp reading electrically but it will change the speed of the water pump which makes this look to be more related to a coolant flow concern.
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I always do but I can not speak for what others do.
Yes this still can be a momentary overheat that that the sudden rise in rpm on the pump or the loss of pump pressure from shutting it off is resolving.